Ebay Carb Rebuild Kits?

[pearljam724]

. All 3 can and have worked, all 3 can and have failed. What ever you choose. If it spins once you're screwed.

Ain't that the truth! Once the straight blade screwdriver failed as the original engineer intended all bets are off.

ac

It's the screwdriver failing that resorts to the next step and using a bit. A bit often works. But, if it fails after first attempt. It's extremely hard to remove them after the bit of your choice spins. The problem starts with people over tightening the jets or using the incorrect size screwdriver. Carbs sitting for long periods doesn't help. Gas can start to gum up in and around tiny jets. Once gas sits for long periods it becomes extremely hard. Plus, you're dealing with very soft brass. Another reason, it's a good idea to remove carbs and clean them at least every couple of years. Even if the bike is running proper. But, very few people honestly do that. Unless, they have a problem.

[avc8130]

Guess what!!!



I've been hitting it with Kroil at least twice daily since this thread was started. I walked by today and decided to give it a whirl. I had a really sharp straight screwdriver that fit in the tube nicely. I used a hammer to aggressively seat the driver into the jet. Then I applied steadily rising torque while pushing down as hard as I could.

VOILA! It spun right out!

Now I need to figure out what jets to order. The plan is a set of chambers and pod filters.

ac

[Alan H]

Err, you won't tighten the new ones so much will you?

[avc8130]

Err, you won't tighten the new ones so much will you?

I didn't put these old ones in...but heck no! Just to snug.

ac

[pearljam724]

Maybe there was some old gas in there seizing the threads. A little hammering of the screwdriver may have loosened it. The head appears to be in good shape. If that's the case. I'd hold onto it. You don't need to change pilots for expansion chambers. Your main jets are called small rounds. I would buy 2 sets of larger mains. One set 3 steps larger, the other set 2 steps larger. Start with a main jet size 3 steps up from factory. Continuously, ride and monitor the plugs. The plug readings can be adjusted, depending on your air screws and pump settings. You need to perform a throttle chop in order to get a proper plug reading. Very easy, but takes some tinkering to get it right. Some people like a rich reading plug to insure longer engine life. I like a plug in between. The richer your tune is the less power and fuel mileage you will have. I like my plugs to be barely tacky. No wetness or excessive dryness. Good job, bud.

[avc8130]

Maybe there was some old gas in there seizing the threads. A little hammering of the screwdriver may have loosened it. The head appears to be in good shape. If that's the case. I'd hold onto it. You don't need to change pilots for expansion chambers. Your main jets are called small rounds. I would buy 2 sets of larger mains. One set 3 steps larger, the other set 2 steps larger. Start with a main jet size 3 steps up from factory. Continuously, ride and monitor the plugs. The plug readings can be adjusted, depending on your air screws and pump settings. You need to perform a throttle chop in order to get a proper plug reading. Very easy, but takes some tinkering to get it right. Some people like a rich reading plug to insure longer engine life. I like a plug in between. The richer your tune is the less power and fuel mileage you will have. I like my plugs to be barely tacky. No wetness or excessive dryness. Good job, bud.

The picture must be deceiving. That head is mangled. For the few bucks the jet costs, I'm not taking the risk.

It looks like the pilots should be 25.

So for the mains, stock is 97.5, 95, 97.5.

I should order 105s and 110s? Or do you count the half-sizes?

Generally speaking, do the stock needles work?

ac

[Coyote]

Maybe I didn't word it correctly. In my post, ez-out and extractor are one in the same.

[pearljam724]

Yes, the stock needles work. You have to look at the chart on the Jets R Us website and go up 3 sizes on the mains. For example if the two outer mains are 97.5. Then go up the next 3 larger main sizes. The factory made the two out cylinder mains larger than the center for heat displacement for the center cylinder. But, it's not necessary to follow that suit. Most people have the same three jet sizes across all 3 carbs. It doesn't create a problem. Looking at the chart the next 3 sizes up would be 110's. Then next 2 sizes up, would be 105's. Buy them both and start with larger main. Double check that they are in fact small rounds and not large rounds. I'm nearly 100% sure, that they are small rounds. http://www.jetsrus.com/a_jets_by_carbur ... _round.htm" onclick="window.open(this.href);return false;

[pearljam724]

Maybe I didn't word it correctly. In my post, ez-out and extractor are one in the same.

I knew that bud. I didn't mean to discredit anything you said.

[avc8130]

Yes, the stock needles work. You have to look at the chart on the Jets R Us website and go up 3 sizes on the mains. For example if the two outer mains are 97.5. Then go up the next 3 larger main sizes. The factory made the two out cylinder mains larger than the center for heat displacement for the center cylinder. But, it's not necessary to follow that suit. Most people have the same three jet sizes across all 3 carbs. It doesn't create a problem. Looking at the chart the next 3 sizes up would be 110's. Then next 2 sizes up, would be 105's. Buy them both and start with larger main. Double check that they are in fact small rounds and not large rounds. I'm nearly 100% sure, that they are small rounds. http://www.jetsrus.com/a_jets_by_carbur ... _round.htm" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;

Ok, that is what I thought. I see the factory had 2.5 increments, but it doesn't seem common once over 100. I'll order up a new 25 pilot and 3ea 105s and 110s.

Thanks!

ac

[Coyote]

102.5 main jets should be available. That's what I wound up with on my 550 with pods and chambers. Stock pilots may or may not work. Mine ran like crap til I got to 3 (32.5) over on the pilots.
Motor refused to return sharply to idle before that point. 4K - 1100 about 10 t0 15 seconds. 3 over cured it.

[avc8130]

102.5 main jets should be available. That's what I wound up with on my 550 with pods and chambers. Stock pilots may or may not work. Mine ran like crap til I got to 3 (32.5) over on the pilots.
Motor refused to return sharply to idle before that point. 4K - 1100 about 10 t0 15 seconds. 3 over cured it.

I need to source jets and all of the carb consumables. Is there a 1 stop shop? The carbs are in pieces, I'll need needles/seats/gaskets/jets/etc.

Is it safe to buy the Ebay kit and throw out the jets? Do the gaskets/O'rings/needle and seat work?
ac

[pearljam724]

102.5 main jets should be available. That's what I wound up with on my 550 with pods and chambers. Stock pilots may or may not work. Mine ran like crap til I got to 3 (32.5) over on the pilots.
Motor refused to return sharply to idle before that point. 4K - 1100 about 10 t0 15 seconds. 3 over cured it.

I need to source jets and all of the carb consumables. Is there a 1 stop shop? The carbs are in pieces, I'll need needles/seats/gaskets/jets/etc.

Is it safe to buy the Ebay kit and throw out the jets? Do the gaskets/O'rings/needle and seat work?
ac

Call Sudco. The largest problem with the kits are needle valves. I wouldn't use the jets either. Your needles may be ok. If you push the needle down and they immediately return when you release them. Great probability that they are ok. You can cut your own gaskets from a gasket sheet bought from an automotive store using your old gaskets as a template. Cutting them with an exacto knife if you wish. Ebay sells the individual jets if you type in the make, type and size. Usually they are a lot cheaper there too. There's a lot of options. Or take the risk on a kit.

[avc8130]

Call Sudco. The largest problem with the kits are needle valves. I wouldn't use the jets either. Your needles may be ok. If you push the needle down and they immediately return when you release them. Great probability that they are ok. You can cut your own gaskets from a gasket sheet bought from an automotive store using your old gaskets as a template. Cutting them with an exacto knife if you wish. Ebay sells the individual jets if you type in the make, type and size. Usually they are a lot cheaper there too. There's a lot of options. Or take the risk on a kit.

I forgot about Sudco. It's been so long since I've really messed with a carb'd bike. The last carb'd bikes I had were a CRF450X and an SV650. Both were running flat slides. My Yamaha Banshee was also carb'd. Reliable jet kits were easily sourced for all of those.

I'll have to really inspect everything I guess. I figured it would have been easier just to start fresh, but I guess that's a pretty pricey on these old girls.

ac

[pearljam724]

Call Sudco. The largest problem with the kits are needle valves. I wouldn't use the jets either. Your needles may be ok. If you push the needle down and they immediately return when you release them. Great probability that they are ok. You can cut your own gaskets from a gasket sheet bought from an automotive store using your old gaskets as a template. Cutting them with an exacto knife if you wish. Ebay sells the individual jets if you type in the make, type and size. Usually they are a lot cheaper there too. There's a lot of options. Or take the risk on a kit.

I forgot about Sudco. It's been so long since I've really messed with a carb'd bike. The last carb'd bikes I had were a CRF450X and an SV650. Both were running flat slides. My Yamaha Banshee was also carb'd. Reliable jet kits were easily sourced for all of those.

I'll have to really inspect everything I guess. I figured it would have been easier just to start fresh, but I guess that's a pretty pricey on these old girls.

ac

Yep, it all adds up quickly if you're doing an extensive job. Carb rebuilds are actually cheap. It's the other cosmetic stuff that adds up. What I would suggest. Get an idea of exactly what you want to do with the bike. Start making a list and total it up. I did a total restoration on a rust bucket of a 750 and projected what it was going to cost me. Of course, I spent nearly a few thousand more than I initially intended. Only because I wanted to go a step further than I initially planned. I don't regret it one bit and I surely don't have a money tree in my back yard. There may be a descent kit out there for these bikes. But, most people agree that they are not worth it. Especially, when the majority of the time you can bypass some of those parts and parts in those kits are often not proper to oem. The jets in the kits, can also have between 8 - 12 % tolerance on the jet size being accurate to Mikuni. And most of those kits would total 90 bucks for three carbs. I had problems with aftermarket needle valves during my restoration. It created a lot of headaches until I figured out what was causing my problem. Decided never to do that again. Not worth it in my opinion.